diff --git a/trustgraph-flow/trustgraph/librarian/librarian.py b/trustgraph-flow/trustgraph/librarian/librarian.py
index 89750c42..87f1d27f 100644
--- a/trustgraph-flow/trustgraph/librarian/librarian.py
+++ b/trustgraph-flow/trustgraph/librarian/librarian.py
@@ -45,20 +45,20 @@ class Librarian:
         # Create object ID for blob
         object_id = uuid.uuid4()
 
-        print("Add blob...")
+        logger.debug("Adding blob...")
 
         await self.blob_store.add(
             object_id, base64.b64decode(request.content),
             request.document_metadata.kind
         )
 
-        print("Add table...")
+        logger.debug("Adding to table...")
 
         await self.table_store.add_document(
             request.document_metadata, object_id
         )
 
-        print("Add complete", flush=True)
+        logger.debug("Add complete")
 
         return LibrarianResponse(
             error = None,
@@ -206,7 +206,7 @@ class Librarian:
             content = content,
         )
 
-        print("Add complete", flush=True)
+        logger.debug("Add complete")
 
         return LibrarianResponse(
             error = None,
diff --git a/trustgraph-flow/trustgraph/librarian/service.py b/trustgraph-flow/trustgraph/librarian/service.py
index d1ce4805..47f1d459 100755
--- a/trustgraph-flow/trustgraph/librarian/service.py
+++ b/trustgraph-flow/trustgraph/librarian/service.py
@@ -7,6 +7,7 @@ from functools import partial
 import asyncio
 import base64
 import json
+import logging
 
 from .. base import AsyncProcessor, Consumer, Producer, Publisher, Subscriber
 from .. base import ConsumerMetrics, ProducerMetrics
@@ -21,6 +22,9 @@ from .. exceptions import RequestError
 
 from . librarian import Librarian
 
+# Module logger
+logger = logging.getLogger(__name__)
+
 default_ident = "librarian"
 
 default_librarian_request_queue = librarian_request_queue
@@ -119,7 +123,7 @@ class Processor(AsyncProcessor):
 
         self.flows = {}
 
-        print("Initialised.", flush=True)
+        logger.info("Librarian service initialized")
 
     async def start(self):
 
@@ -129,7 +133,7 @@ class Processor(AsyncProcessor):
 
     async def on_librarian_config(self, config, version):
 
-        print("config version", version)
+        logger.info(f"Configuration version: {version}")
 
         if "flows" in config:
 
@@ -138,7 +142,7 @@ class Processor(AsyncProcessor):
                 for k, v in config["flows"].items()
             }
 
-        print(self.flows)
+        logger.debug(f"Flows: {self.flows}")
 
     def __del__(self):
 
@@ -146,9 +150,9 @@ class Processor(AsyncProcessor):
 
     async def load_document(self, document, processing, content):
 
-        print("Ready for processing...")
+        logger.debug("Ready for document processing...")
 
-        print(document, processing, len(content))
+        logger.debug(f"Document: {document}, processing: {processing}, content length: {len(content)}")
 
         if processing.flow not in self.flows:
             raise RuntimeError("Invalid flow ID")
@@ -188,7 +192,7 @@ class Processor(AsyncProcessor):
             )
             schema = Document
 
-        print(f"Submit on queue {q}...")
+        logger.debug(f"Submitting to queue {q}...")
 
         pub = Publisher(
             self.pulsar_client, q, schema=schema
@@ -203,14 +207,14 @@ class Processor(AsyncProcessor):
 
         await pub.stop()
 
-        print("Document submitted")
+        logger.debug("Document submitted")
 
     async def process_request(self, v):
 
         if v.operation is None:
             raise RequestError("Null operation")
 
-        print("request", v.operation)
+        logger.debug(f"Librarian request: {v.operation}")
 
         impls = {
             "add-document": self.librarian.add_document,
@@ -237,7 +241,7 @@ class Processor(AsyncProcessor):
 
         id = msg.properties()["id"]
 
-        print(f"Handling input {id}...", flush=True)
+        logger.info(f"Handling librarian input {id}...")
 
         try:
 
@@ -276,7 +280,7 @@ class Processor(AsyncProcessor):
 
             return
 
-        print("Done.", flush=True)
+        logger.debug("Librarian input processing complete")
 
     @staticmethod
     def add_args(parser):